Construction method of continuous laying of sand and gravel dam in high altitude area

Abstract

The invention discloses a construction method for continuous laying of a gravel dam in a high attitude area. The construction method comprises the following steps: allowing a pair of lower dam shell material layers to be formed; compacting the lower dam shell material layers; and taking the lower dam shell material layers as the foundation, laying dam shell materials layer by layer from bottom to top, and performing rolling compaction layer by layer to form a pair of gravel dams with the dam temperature being in field distribution, wherein the step of laying the dam shell materials layer by layer comprises the following sub-steps: performing loosening treatment on the frozen surfaces of the lower dam shell material layers under the condition that the daily average solar radiation amount of the daytime is 4.53*10[11]-6.43*10[11] MJ; and laying the dam shell materials on the loosened surfaces of the lower dam shell material layers, so that each of the previously laid lower dam shell material layers is covered with a newly laid upper dam shell material layer, and the temperature of the lower dam shell material layers is improved. According to the construction method for continuous laying of the gravel dam in the high attitude area, the specific sunshine condition in the high attitude area is utilized, the dam shell materials are directly laid on the surfaces of the laid lower dam shell material layers, so that the conduction function of heat energy in the previously laid lower dam shell material layers is utilized, the previously laid lower dam shell material layers and the newly laid upper dam shell material layers are densely combined, the construction is carried out smoothly, and the construction efficiency is increased.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a construction method for continuously laying sand and gravel dams in high-altitude areas. Background technique [0002] With the rapid development of domestic water conservancy and hydropower engineering construction, the treatment scope, depth, and stratum structure are becoming more complicated and diversified. In the prior art, when constructing asphalt concrete core wall dams, it is often necessary to follow the water conservancy and hydropower construction specifications, as stipulated in the specifications: [0003] 1. Construction can only be carried out when the minimum temperature is greater than 0°C, the wind force is less than level 4, and the daily precipitation is less than 5mm; [0004] 2. In the process of laying asphalt concrete, the surface temperature of the lower layer of asphalt concrete layer laid first must be above 70 °C before ...

AI Technical Summary

Problems solved by technology

[0005] 3. The thickness of the asphalt concrete layer paved in a single layer shall not be greater than 25cm;

[0010] However, due to the development of water conservancy and hydropower projects, it is often necessary to work in high-altitude areas. These areas are high-cold and hypoxic, and the air is thin. The amount is sometimes greater than 10mm), in these areas, the physical and mechanical properties of asphalt materials and asphalt concrete will be affected by plateau environmental factors. Quality and safety, construction methods to improve construction efficiency

Images